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Lookup NU author(s): Emerita Professor Marion Petrie
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It has been suggested that female birds put more resources into eggs fathered by attractive males by laying larger eggs or by adding more testosterone, but this inference could be undermined if eggs of different sex are provisioned differently, as these studies did not control for sex differences. Here we compare hormone concentrations in the yolks of male and female eggs and find that these are significantly different. Our results indicate that it is premature to conclude that female birds invest more in eggs sired by a preferred male, and raise the possibility that yolk sex steroids may be part of the sex-determining process in birds.
Author(s): Petrie M, Schwabl H, Brande-Lavridsen N, Burke T
Publication type: Article
Publication status: Published
ISSN (print): 0028-0836
ISSN (electronic): 1476-4687
Publisher: Nature Publishing Group
PubMed id: 11484039
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